Sparkyjoe is 100% correct in saying -consistency- is the most important thing here. Pick two or three words or sounds and use -only- those. Your pup just isn't house trained yet. Some take time to get good at it, more if they are feeling anxious or confused (too many words used, rebukes she doesn't understand) about what is expected of them.
First - have her vet checked to rule out bladder issues. A pup with a trick bladder won't be 'fixed' by anything but a vet.
That ruled out, try praising her a LOT and maybe even giving her a small treat when she manages to pee outside. It's just as important that you are out there with her, as well, to teach her what's the -right- thing as well as the wrong thing to do.
How much attention is she getting for peeing outside, as opposed to when she pees inside?
Dobies are eager to please, usually, and punishing a puppy more than 10 seconds after they do a wrong thing is totally wasted effort - and will only increase her anxiety (another cause of excessive house peeing), as she'll have no idea what's she's being yelled at for. Not that she should be being yelled at.
How often do you take her out to pee? Every two hours is not abnormal for a pup. Also, watch her carefully for 'signs' she is about to pee (sniffing about, circling, restlessness, seeking corners, whatever her thing is) and swiftly take her out.
Take her out every two hours regardless, and tell her she's a good dog, even if she doesn't pee. Don't play with her or talk to her, just let her sniff around and pee if she needs to. This should not be 'too much hard work' - she is just a pup and her needs have to be met.
I used to use a sharp (NOT loud!) 'bah!" sound to show disapproval, I never used regular 'human' words that the dog might hear a lot in conversation. And then took my pups outside, immediately, even if they weren't 'finished' (lots of paper towelling kept handy!).
Also, for pups that proved harder to train, I'd keep a little paper from the last pee and lay that on top of new paper for the scent, which is where I'd take the pup to pee instead of shoving them outside, which can be overwhelming for some. Every day I moved the paper closer to the door until it was outside, and from there 'outside' was the place to pee.
Patience and watchfulness, and your continual presence is necessary for her to learn what's right and wrong.
I'd suggest joining a local kennel club for puppy classes. Lots of knowledgeable people to talk to, as well as opportunity to help the pup learn important things - socialisation and basic manners, etc. This will help you gain her trust so training at home is easier, too.
Last edited by Aus; 03-14-2012 at 08:05 PM.